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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8163d453b0cde7f003ad69df6c4c12b626e57c22f715a0ea4ee23ebedf7342e1' 
  AND token = 'jatk2Ly5vj3o1NDhgpNvzQ03BwaFa1aRoW2nwYswaAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}